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li{word-wrap:break-all}div#p>svg>foreignObject>section li>p{margin-top:16px}div#p>svg>foreignObject>section li+li{margin-top:.25em}div#p>svg>foreignObject>section dl{padding:0}div#p>svg>foreignObject>section dl dt{padding:0;margin-top:16px;font-size:1em;font-style:italic;font-weight:600}div#p>svg>foreignObject>section dl dd{padding:0 16px;margin-bottom:16px}div#p>svg>foreignObject>section table{display:block;width:100%;overflow:auto}div#p>svg>foreignObject>section table th{font-weight:600}div#p>svg>foreignObject>section table td,div#p>svg>foreignObject>section table th{padding:6px 13px;border:1px solid #dfe2e5}div#p>svg>foreignObject>section table tr{background-color:#fff;border-top:1px solid #c6cbd1}div#p>svg>foreignObject>section table tr:nth-child(2n){background-color:#f6f8fa}div#p>svg>foreignObject>section img{max-width:100%;box-sizing:initial;background-color:#fff}div#p>svg>foreignObject>section img[align=right]{padding-left:20px}div#p>svg>foreignObject>section img[align=left]{padding-right:20px}div#p>svg>foreignObject>section code{padding:.2em .4em;margin:0;font-size:85%;background-color:rgba(27,31,35,.05);border-radius:3px}div#p>svg>foreignObject>section pre{word-wrap:normal}div#p>svg>foreignObject>section pre>code{padding:0;margin:0;font-size:100%;word-break:normal;white-space:pre;background:transparent;border:0}div#p>svg>foreignObject>section .highlight{margin-bottom:16px}div#p>svg>foreignObject>section .highlight pre{margin-bottom:0;word-break:normal}div#p>svg>foreignObject>section pre{padding:16px;overflow:auto;font-size:85%;line-height:1.45;background-color:#f6f8fa;border-radius:3px}div#p>svg>foreignObject>section pre code{display:inline;max-width:auto;padding:0;margin:0;overflow:visible;line-height:inherit;word-wrap:normal;background-color:initial;border:0}div#p>svg>foreignObject>section .commit-tease-sha{display:inline-block;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;font-size:90%;color:#444d56}div#p>svg>foreignObject>section div#p>svg>foreignObject>section section.commit-tease-sha{--marpit-root-font-size:90%}div#p>svg>foreignObject>section .full-commit .btn-outline:not(:disabled):hover{color:#005cc5;border-color:#005cc5}div#p>svg>foreignObject>section .blob-wrapper{overflow-x:auto;overflow-y:hidden}div#p>svg>foreignObject>section .blob-wrapper-embedded{max-height:240px;overflow-y:auto}div#p>svg>foreignObject>section .blob-num{width:1%;min-width:50px;padding-right:10px;padding-left:10px;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;font-size:12px;line-height:20px;color:rgba(27,31,35,.3);text-align:right;white-space:nowrap;vertical-align:top;cursor:pointer;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}div#p>svg>foreignObject>section div#p>svg>foreignObject>section section.blob-num{--marpit-root-font-size:12px}div#p>svg>foreignObject>section .blob-num:hover{color:rgba(27,31,35,.6)}div#p>svg>foreignObject>section .blob-num:before{content:attr(data-line-number)}div#p>svg>foreignObject>section .blob-code{position:relative;padding-right:10px;padding-left:10px;line-height:20px;vertical-align:top}div#p>svg>foreignObject>section .blob-code-inner{overflow:visible;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;font-size:12px;color:#24292e;word-wrap:normal;white-space:pre}div#p>svg>foreignObject>section div#p>svg>foreignObject>section section.blob-code-inner{--marpit-root-font-size:12px}div#p>svg>foreignObject>section .pl-token.active,div#p>svg>foreignObject>section .pl-token:hover{cursor:pointer;background:#ffea7f}div#p>svg>foreignObject>section .tab-size[data-tab-size="1"]{-moz-tab-size:1;-o-tab-size:1;tab-size:1}div#p>svg>foreignObject>section .tab-size[data-tab-size="2"]{-moz-tab-size:2;-o-tab-size:2;tab-size:2}div#p>svg>foreignObject>section .tab-size[data-tab-size="3"]{-moz-tab-size:3;-o-tab-size:3;tab-size:3}div#p>svg>foreignObject>section .tab-size[data-tab-size="4"]{-moz-tab-size:4;-o-tab-size:4;tab-size:4}div#p>svg>foreignObject>section .tab-size[data-tab-size="5"]{-moz-tab-size:5;-o-tab-size:5;tab-size:5}div#p>svg>foreignObject>section .tab-size[data-tab-size="6"]{-moz-tab-size:6;-o-tab-size:6;tab-size:6}div#p>svg>foreignObject>section .tab-size[data-tab-size="7"]{-moz-tab-size:7;-o-tab-size:7;tab-size:7}div#p>svg>foreignObject>section .tab-size[data-tab-size="8"]{-moz-tab-size:8;-o-tab-size:8;tab-size:8}div#p>svg>foreignObject>section .tab-size[data-tab-size="9"]{-moz-tab-size:9;-o-tab-size:9;tab-size:9}div#p>svg>foreignObject>section .tab-size[data-tab-size="10"]{-moz-tab-size:10;-o-tab-size:10;tab-size:10}div#p>svg>foreignObject>section .tab-size[data-tab-size="11"]{-moz-tab-size:11;-o-tab-size:11;tab-size:11}div#p>svg>foreignObject>section .tab-size[data-tab-size="12"]{-moz-tab-size:12;-o-tab-size:12;tab-size:12}div#p>svg>foreignObject>section .task-list-item{list-style-type:none}div#p>svg>foreignObject>section .task-list-item+.task-list-item{margin-top:3px}div#p>svg>foreignObject>section .task-list-item input{margin:0 .2em .25em -1.6em;vertical-align:middle}div#p>svg>foreignObject>section .hljs{display:block;background:#fff;padding:.5em;color:#333;overflow-x:auto}div#p>svg>foreignObject>section .hljs-comment,div#p>svg>foreignObject>section .hljs-meta{color:#969896}div#p>svg>foreignObject>section .hljs-emphasis,div#p>svg>foreignObject>section .hljs-quote,div#p>svg>foreignObject>section .hljs-strong,div#p>svg>foreignObject>section .hljs-template-variable,div#p>svg>foreignObject>section .hljs-variable{color:#df5000}div#p>svg>foreignObject>section .hljs-keyword,div#p>svg>foreignObject>section .hljs-selector-tag,div#p>svg>foreignObject>section .hljs-type{color:#d73a49}div#p>svg>foreignObject>section .hljs-attribute,div#p>svg>foreignObject>section .hljs-bullet,div#p>svg>foreignObject>section .hljs-literal,div#p>svg>foreignObject>section .hljs-symbol{color:#0086b3}div#p>svg>foreignObject>section .hljs-name,div#p>svg>foreignObject>section .hljs-section{color:#63a35c}div#p>svg>foreignObject>section .hljs-tag{color:#333}div#p>svg>foreignObject>section .hljs-attr,div#p>svg>foreignObject>section .hljs-selector-attr,div#p>svg>foreignObject>section .hljs-selector-class,div#p>svg>foreignObject>section .hljs-selector-id,div#p>svg>foreignObject>section .hljs-selector-pseudo,div#p>svg>foreignObject>section .hljs-title{color:#6f42c1}div#p>svg>foreignObject>section .hljs-addition{color:#55a532;background-color:#eaffea}div#p>svg>foreignObject>section .hljs-deletion{color:#bd2c00;background-color:#ffecec}div#p>svg>foreignObject>section .hljs-link{text-decoration:underline}div#p>svg>foreignObject>section .hljs-number{color:#005cc5}div#p>svg>foreignObject>section .hljs-string{color:#032f62}div#p>svg>foreignObject>section svg[data-marp-fitting=svg]{max-height:563px}div#p>svg>foreignObject>section h1{color:#246;font-size:1.6em}div#p>svg>foreignObject>section h1,div#p>svg>foreignObject>section h2{border-bottom:none}div#p>svg>foreignObject>section h2{font-size:1.3em}div#p>svg>foreignObject>section h3{font-size:1.1em}div#p>svg>foreignObject>section h4{font-size:1.05em}div#p>svg>foreignObject>section h5{font-size:1em}div#p>svg>foreignObject>section h6{font-size:.9em}div#p>svg>foreignObject>section h1 strong,div#p>svg>foreignObject>section h2 strong,div#p>svg>foreignObject>section h3 strong,div#p>svg>foreignObject>section h4 strong,div#p>svg>foreignObject>section h5 strong,div#p>svg>foreignObject>section h6 strong{font-weight:inherit;color:#48c}div#p>svg>foreignObject>section hr{height:0;padding-top:.25em}div#p>svg>foreignObject>section pre{border:1px solid #999;line-height:1.15;overflow:visible}div#p>svg>foreignObject>section pre code svg[data-marp-fitting=svg]{max-height:529px}div#p>svg>foreignObject>section footer,div#p>svg>foreignObject>section header{margin:0;position:absolute;left:30px;color:hsla(0,0%,40%,.75);font-size:18px}div#p>svg>foreignObject>section header{top:21px}div#p>svg>foreignObject>section footer{bottom:21px}div#p>svg>foreignObject>section{align-items:stretch;background:#fff;display:flex;flex-direction:column;flex-wrap:nowrap;font-size:29px;height:720px;justify-content:center;padding:78.5px;width:1280px}div#p>svg>foreignObject>section{--marpit-root-font-size:29px}div#p>svg>foreignObject>section>:last-child,div#p>svg>foreignObject>section[data-footer]>:nth-last-child(2){margin-bottom:0}div#p>svg>foreignObject>section>:first-child,div#p>svg>foreignObject>section>header:first-child+*{margin-top:0}div#p>svg>foreignObject>section:after{position:absolute;padding:0;right:30px;bottom:21px;font-size:24px;color:#777}div#p>svg>foreignObject>section:after{--marpit-root-font-size:24px}div#p>svg>foreignObject>section.invert{background-color:#222;color:#e6eaf0}div#p>svg>foreignObject>section.invert:after{color:#999}div#p>svg>foreignObject>section.invert img{background-color:transparent}div#p>svg>foreignObject>section.invert a{color:#50b3ff}div#p>svg>foreignObject>section.invert h1{color:#a3c5e7}div#p>svg>foreignObject>section.invert h2,div#p>svg>foreignObject>section.invert h3,div#p>svg>foreignObject>section.invert h4,div#p>svg>foreignObject>section.invert h5{color:#ebeff5}div#p>svg>foreignObject>section.invert blockquote,div#p>svg>foreignObject>section.invert h6{border-color:#3d3f43;color:#939699}div#p>svg>foreignObject>section.invert h1 strong,div#p>svg>foreignObject>section.invert h2 strong,div#p>svg>foreignObject>section.invert h3 strong,div#p>svg>foreignObject>section.invert h4 strong,div#p>svg>foreignObject>section.invert h5 strong,div#p>svg>foreignObject>section.invert h6 strong{color:#7bf}div#p>svg>foreignObject>section.invert hr{background-color:#3d3f43}div#p>svg>foreignObject>section.invert footer,div#p>svg>foreignObject>section.invert header{color:hsla(0,0%,60%,.75)}div#p>svg>foreignObject>section.invert code,div#p>svg>foreignObject>section.invert kbd{background-color:#111}div#p>svg>foreignObject>section.invert kbd{border-color:#666;box-shadow:inset 0 -1px 0 #555;color:#e6eaf0}div#p>svg>foreignObject>section.invert table tr{background-color:#12181d;border-color:#60657b}div#p>svg>foreignObject>section.invert table tr:nth-child(2n){background-color:#1b2024}div#p>svg>foreignObject>section.invert table td,div#p>svg>foreignObject>section.invert table th{border-color:#5b5e61}div#p>svg>foreignObject>section.invert pre{background-color:#0a0e12;border-color:#777}div#p>svg>foreignObject>section.invert pre code{background-color:transparent}div#p>svg>foreignObject>section[data-color] h1,div#p>svg>foreignObject>section[data-color] h2,div#p>svg>foreignObject>section[data-color] h3,div#p>svg>foreignObject>section[data-color] h4,div#p>svg>foreignObject>section[data-color] h5,div#p>svg>foreignObject>section[data-color] h6{color:currentColor}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]{display:block!important;padding:0!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]:after,div#p>svg>foreignObject>section[data-marpit-advanced-background=background]:before,div#p>svg>foreignObject>section[data-marpit-advanced-background=content]:after,div#p>svg>foreignObject>section[data-marpit-advanced-background=content]:before{display:none!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]{all:initial;display:flex;flex-direction:row;height:100%;overflow:hidden;width:100%}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container][data-marpit-advanced-background-direction=vertical]{flex-direction:column}div#p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split]>div[data-marpit-advanced-background-container]{width:var(--marpit-advanced-background-split,50%)}div#p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split=right]>div[data-marpit-advanced-background-container]{margin-left:calc(100% - var(--marpit-advanced-background-split, 50%))}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]>figure{all:initial;background-position:center;background-repeat:no-repeat;background-size:cover;flex:auto;margin:0}div#p>svg>foreignObject>section[data-marpit-advanced-background=content],div#p>svg>foreignObject>section[data-marpit-advanced-background=pseudo]{background:transparent!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=pseudo],div#p>svg[data-marpit-svg]>foreignObject[data-marpit-advanced-background=pseudo]{pointer-events:none!important}div#p>svg>foreignObject>section[data-marpit-advanced-background-split]{width:100%;height:100%}</style></head><body><div class="bespoke-marp-osc"><button data-bespoke-marp-osc="prev" tabindex="-1" title="Previous slide">Previous slide</button><span data-bespoke-marp-osc="page"></span><button data-bespoke-marp-osc="next" tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id="p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1">
<h1>凯撒密码 (Caesar Cipher)</h1>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2">
<h2>大致计算方法：</h2>
<p><svg data-marp-fitting="svg" data-marp-fitting-math><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="katex-display"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><semantics><mrow><mtext>密文</mtext><mo>=</mo><mi>c</mi><mi>h</mi><mi>r</mi><mo stretchy="false">(</mo><mi>o</mi><mi>r</mi><mi>d</mi><mo stretchy="false">(</mo><mtext>明文</mtext><mo stretchy="false">)</mo><mo>+</mo><mtext>偏移量</mtext><mo stretchy="false">)</mo></mrow><annotation encoding="application/x-tex">密文 = chr(ord(明文) + 偏移量)
</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.68333em;vertical-align:0em;"></span><span class="mord cjk_fallback">密</span><span class="mord cjk_fallback">文</span><span class="mspace" style="margin-right:0.2777777777777778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2777777777777778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">c</span><span class="mord mathnormal">h</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mopen">(</span><span class="mord mathnormal">o</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">d</span><span class="mopen">(</span><span class="mord cjk_fallback">明</span><span class="mord cjk_fallback">文</span><span class="mclose">)</span><span class="mspace" style="margin-right:0.2222222222222222em;"></span><span class="mbin">+</span><span class="mspace" style="margin-right:0.2222222222222222em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord cjk_fallback">偏</span><span class="mord cjk_fallback">移</span><span class="mord cjk_fallback">量</span><span class="mclose">)</span></span></span></span></span></span></span></foreignObject></svg></p><h4>当“偏移量”为 3 时：</h4>
<table>
<thead>
<tr>
<th style="text-align:center">明文</th>
<th style="text-align:center">A</th>
<th style="text-align:center">B</th>
<th style="text-align:center">C</th>
<th style="text-align:center">D</th>
<th style="text-align:center">E</th>
<th style="text-align:center">F</th>
<th style="text-align:center">G</th>
<th style="text-align:center">H</th>
<th style="text-align:center">I</th>
<th style="text-align:center">J</th>
<th style="text-align:center">K</th>
<th style="text-align:center">L</th>
<th style="text-align:center">M</th>
<th style="text-align:center">...</th>
<th style="text-align:center">W</th>
<th style="text-align:center">X</th>
<th style="text-align:center">Y</th>
<th style="text-align:center">Z</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:center"><strong>密文</strong></td>
<td style="text-align:center">D</td>
<td style="text-align:center">E</td>
<td style="text-align:center">F</td>
<td style="text-align:center">G</td>
<td style="text-align:center">H</td>
<td style="text-align:center">I</td>
<td style="text-align:center">J</td>
<td style="text-align:center">K</td>
<td style="text-align:center">L</td>
<td style="text-align:center">M</td>
<td style="text-align:center">N</td>
<td style="text-align:center">O</td>
<td style="text-align:center">P</td>
<td style="text-align:center">...</td>
<td style="text-align:center">Z</td>
<td style="text-align:center">A</td>
<td style="text-align:center">B</td>
<td style="text-align:center">C</td>
</tr>
</tbody>
</table>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3">
<h1>示例 1:</h1>
<h4>编写 Python 程序，用密码 3 对单词 'apple' 进行加密：（只允许小写字母）</h4>
<pre><code class="language-Python"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>x = <span class="hljs-number">3</span>
a = <span class="hljs-string">&#x27;apple&#x27;</span>
b = <span class="hljs-number">0</span>
c = <span class="hljs-string">&#x27;&#x27;</span>                      <span class="hljs-comment"># 空字符串用于保存结果</span>
<span class="hljs-keyword">while</span>(b&lt;<span class="hljs-built_in">len</span>(a)):
    d = <span class="hljs-built_in">ord</span>(a[b])-<span class="hljs-built_in">ord</span>(<span class="hljs-string">&#x27;a&#x27;</span>)      <span class="hljs-comment"># 明文字母序号</span>
    e = (d + x) % <span class="hljs-number">26</span>            <span class="hljs-comment"># 密文字母序号</span>
    f = <span class="hljs-built_in">ord</span>(<span class="hljs-string">&#x27;a&#x27;</span>) + e            <span class="hljs-comment"># 密文的 ASCII 编号</span>
    c = c + <span class="hljs-built_in">chr</span>(f)
    b = b + <span class="hljs-number">1</span>
print(c)
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4">
<h1>练习 1:</h1>
<h4>编写 Python 程序，用密码 3 对单词 'Apple' 进行加密：（区分大小写字母）</h4>
<pre><code class="language-Python"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>









</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5">
<h1>练习 2</h1>
<h3>编写程序，使用 input 函数获取待加密文件名以及密码(数字)，进行加密。</h3>
<pre><code class="language-Python"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>










</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6">
<h1>练习 3</h1>
<h3>尝试编写程序，实现对已加密文件进行解密</h3>
<pre><code class="language-Python"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>










</span></span></foreignObject></svg></code></pre>
</section>
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